package com.harbour.mmall.common;


import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

public class TokenCache {
    //先声明日志
    private static Logger logger = LoggerFactory.getLogger(TokenCache.class);

    public static final String TOKEN_PREFIX = "token_";

    //静态内存块
    /*
    *initialCapacity(1000)  设置缓存的初始化容量
    *maximumSize(10000) 缓存最大容量，当超过此容量采用LRU算法来移除缓存项
    * .expireAfterAccess(12,TimeUnit.HOURS) 设置缓存有效期，不要超过12小时
    */
    private static LoadingCache<String,String> localCache = CacheBuilder.newBuilder().initialCapacity(1000).maximumSize(10000)
        .expireAfterAccess(12,TimeUnit.HOURS)
        .build(new CacheLoader<String, String>() {
                    //默认的数据加载实现，当调用get取值的时候，如果key没有对应值，就调用这个方法来加载
                    @Override
                    public String load(String s) throws Exception {
                        return "null";
                    }
        });

    public static void setKey(String key,String value){
        localCache.put(key,value);
    }

    public static String getKey(String key){
        String value = null;
        try{
            value = localCache.get(key);
            if("null".equals(value)){
                return null;
            }
            return value;
        }catch (Exception e){
            logger.error("localCache get error",e);
        }
        return null;
    }

















}
